pretty good tutorial bro. i like the presentation of the information, is very easy to understand and the pictures explains it all by them selfs.
thats exactly how i do all my carpeted enclosures. i figured most people used the same technique. since its so simple and you dont have to buy or use extra tool to do it.
one thing you have to keep in mind while you're assembling the enclosure is to clean up any glue that got into the grove. if you don't is going to be tricky to clean up after it has dried and if you don't clean it up the carpet will not go into the grove.
also here is an image of a jig i made to keep the blade from ever hitting the aluminum guide, its simple and very easy to make, and will keep your guide from getting damaged by the blade.
again great job on the tutorial.